auto import from //depot/cupcake/@135843
diff --git a/libnetutils/ifc_utils.c b/libnetutils/ifc_utils.c
new file mode 100644
index 0000000..88635d9
--- /dev/null
+++ b/libnetutils/ifc_utils.c
@@ -0,0 +1,428 @@
+/*
+ * Copyright 2008, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+
+#include <sys/socket.h>
+#include <sys/select.h>
+#include <sys/types.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#include <linux/if.h>
+#include <linux/sockios.h>
+#include <linux/route.h>
+#include <linux/wireless.h>
+
+#ifdef ANDROID
+#define LOG_TAG "NetUtils"
+#include <cutils/log.h>
+#include <cutils/properties.h>
+#else
+#include <stdio.h>
+#include <string.h>
+#define LOGD printf
+#define LOGW printf
+#endif
+
+static int ifc_ctl_sock = -1;
+void printerr(char *fmt, ...);
+
+static const char *ipaddr_to_string(uint32_t addr)
+{
+ struct in_addr in_addr;
+
+ in_addr.s_addr = addr;
+ return inet_ntoa(in_addr);
+}
+
+int ifc_init(void)
+{
+ if (ifc_ctl_sock == -1) {
+ ifc_ctl_sock = socket(AF_INET, SOCK_DGRAM, 0);
+ if (ifc_ctl_sock < 0) {
+ printerr("socket() failed: %s\n", strerror(errno));
+ }
+ }
+ return ifc_ctl_sock < 0 ? -1 : 0;
+}
+
+void ifc_close(void)
+{
+ if (ifc_ctl_sock != -1) {
+ (void)close(ifc_ctl_sock);
+ ifc_ctl_sock = -1;
+ }
+}
+
+static void ifc_init_ifr(const char *name, struct ifreq *ifr)
+{
+ memset(ifr, 0, sizeof(struct ifreq));
+ strncpy(ifr->ifr_name, name, IFNAMSIZ);
+ ifr->ifr_name[IFNAMSIZ - 1] = 0;
+}
+
+int ifc_get_hwaddr(const char *name, void *ptr)
+{
+ int r;
+ struct ifreq ifr;
+ ifc_init_ifr(name, &ifr);
+
+ r = ioctl(ifc_ctl_sock, SIOCGIFHWADDR, &ifr);
+ if(r < 0) return -1;
+
+ memcpy(ptr, &ifr.ifr_hwaddr.sa_data, 6);
+ return 0;
+}
+
+int ifc_get_ifindex(const char *name, int *if_indexp)
+{
+ int r;
+ struct ifreq ifr;
+ ifc_init_ifr(name, &ifr);
+
+ r = ioctl(ifc_ctl_sock, SIOCGIFINDEX, &ifr);
+ if(r < 0) return -1;
+
+ *if_indexp = ifr.ifr_ifindex;
+ return 0;
+}
+
+static int ifc_set_flags(const char *name, unsigned set, unsigned clr)
+{
+ struct ifreq ifr;
+ ifc_init_ifr(name, &ifr);
+
+ if(ioctl(ifc_ctl_sock, SIOCGIFFLAGS, &ifr) < 0) return -1;
+ ifr.ifr_flags = (ifr.ifr_flags & (~clr)) | set;
+ return ioctl(ifc_ctl_sock, SIOCSIFFLAGS, &ifr);
+}
+
+int ifc_up(const char *name)
+{
+ return ifc_set_flags(name, IFF_UP, 0);
+}
+
+int ifc_down(const char *name)
+{
+ return ifc_set_flags(name, 0, IFF_UP);
+}
+
+static void init_sockaddr_in(struct sockaddr *sa, in_addr_t addr)
+{
+ struct sockaddr_in *sin = (struct sockaddr_in *) sa;
+ sin->sin_family = AF_INET;
+ sin->sin_port = 0;
+ sin->sin_addr.s_addr = addr;
+}
+
+int ifc_set_addr(const char *name, in_addr_t addr)
+{
+ struct ifreq ifr;
+
+ ifc_init_ifr(name, &ifr);
+ init_sockaddr_in(&ifr.ifr_addr, addr);
+
+ return ioctl(ifc_ctl_sock, SIOCSIFADDR, &ifr);
+}
+
+int ifc_set_mask(const char *name, in_addr_t mask)
+{
+ struct ifreq ifr;
+
+ ifc_init_ifr(name, &ifr);
+ init_sockaddr_in(&ifr.ifr_addr, mask);
+
+ return ioctl(ifc_ctl_sock, SIOCSIFNETMASK, &ifr);
+}
+
+int ifc_get_info(const char *name, in_addr_t *addr, in_addr_t *mask, unsigned *flags)
+{
+ struct ifreq ifr;
+ ifc_init_ifr(name, &ifr);
+
+ if (addr != NULL) {
+ if(ioctl(ifc_ctl_sock, SIOCGIFADDR, &ifr) < 0) {
+ *addr = 0;
+ } else {
+ *addr = ((struct sockaddr_in*) &ifr.ifr_addr)->sin_addr.s_addr;
+ }
+ }
+
+ if (mask != NULL) {
+ if(ioctl(ifc_ctl_sock, SIOCGIFNETMASK, &ifr) < 0) {
+ *mask = 0;
+ } else {
+ *mask = ((struct sockaddr_in*) &ifr.ifr_addr)->sin_addr.s_addr;
+ }
+ }
+
+ if (flags != NULL) {
+ if(ioctl(ifc_ctl_sock, SIOCGIFFLAGS, &ifr) < 0) {
+ *flags = 0;
+ } else {
+ *flags = ifr.ifr_flags;
+ }
+ }
+
+ return 0;
+}
+
+
+int ifc_create_default_route(const char *name, in_addr_t addr)
+{
+ struct rtentry rt;
+
+ memset(&rt, 0, sizeof(rt));
+
+ rt.rt_dst.sa_family = AF_INET;
+ rt.rt_flags = RTF_UP | RTF_GATEWAY;
+ rt.rt_dev = (void*) name;
+ init_sockaddr_in(&rt.rt_genmask, 0);
+ init_sockaddr_in(&rt.rt_gateway, addr);
+
+ return ioctl(ifc_ctl_sock, SIOCADDRT, &rt);
+}
+
+int ifc_add_host_route(const char *name, in_addr_t addr)
+{
+ struct rtentry rt;
+ int result;
+
+ memset(&rt, 0, sizeof(rt));
+
+ rt.rt_dst.sa_family = AF_INET;
+ rt.rt_flags = RTF_UP | RTF_HOST;
+ rt.rt_dev = (void*) name;
+ init_sockaddr_in(&rt.rt_dst, addr);
+ init_sockaddr_in(&rt.rt_genmask, 0);
+ init_sockaddr_in(&rt.rt_gateway, 0);
+
+ ifc_init();
+ result = ioctl(ifc_ctl_sock, SIOCADDRT, &rt);
+ if (result < 0 && errno == EEXIST) {
+ result = 0;
+ }
+ ifc_close();
+ return result;
+}
+
+int ifc_disable(const char *ifname)
+{
+ int result;
+
+ ifc_init();
+ result = ifc_down(ifname);
+ ifc_set_addr(ifname, 0);
+ ifc_close();
+ return result;
+}
+
+int ifc_reset_connections(const char *ifname)
+{
+#ifdef HAVE_ANDROID_OS
+ int result;
+ in_addr_t myaddr;
+ struct ifreq ifr;
+
+ ifc_init();
+ ifc_get_info(ifname, &myaddr, NULL, NULL);
+ ifc_init_ifr(ifname, &ifr);
+ init_sockaddr_in(&ifr.ifr_addr, myaddr);
+ result = ioctl(ifc_ctl_sock, SIOCKILLADDR, &ifr);
+ ifc_close();
+
+ return result;
+#else
+ return 0;
+#endif
+}
+
+/*
+ * Remove the routes associated with the named interface.
+ */
+int ifc_remove_host_routes(const char *name)
+{
+ char ifname[64];
+ in_addr_t dest, gway, mask;
+ int flags, refcnt, use, metric, mtu, win, irtt;
+ struct rtentry rt;
+ FILE *fp;
+ struct in_addr addr;
+
+ fp = fopen("/proc/net/route", "r");
+ if (fp == NULL)
+ return -1;
+ /* Skip the header line */
+ if (fscanf(fp, "%*[^\n]\n") < 0) {
+ fclose(fp);
+ return -1;
+ }
+ ifc_init();
+ for (;;) {
+ int nread = fscanf(fp, "%63s%X%X%X%d%d%d%X%d%d%d\n",
+ ifname, &dest, &gway, &flags, &refcnt, &use, &metric, &mask,
+ &mtu, &win, &irtt);
+ if (nread != 11) {
+ break;
+ }
+ if ((flags & (RTF_UP|RTF_HOST)) != (RTF_UP|RTF_HOST)
+ || strcmp(ifname, name) != 0) {
+ continue;
+ }
+ memset(&rt, 0, sizeof(rt));
+ rt.rt_dev = (void *)name;
+ init_sockaddr_in(&rt.rt_dst, dest);
+ init_sockaddr_in(&rt.rt_gateway, gway);
+ init_sockaddr_in(&rt.rt_genmask, mask);
+ addr.s_addr = dest;
+ if (ioctl(ifc_ctl_sock, SIOCDELRT, &rt) < 0) {
+ LOGD("failed to remove route for %s to %s: %s",
+ ifname, inet_ntoa(addr), strerror(errno));
+ }
+ }
+ fclose(fp);
+ ifc_close();
+ return 0;
+}
+
+/*
+ * Return the address of the default gateway
+ *
+ * TODO: factor out common code from this and remove_host_routes()
+ * so that we only scan /proc/net/route in one place.
+ */
+int ifc_get_default_route(const char *ifname)
+{
+ char name[64];
+ in_addr_t dest, gway, mask;
+ int flags, refcnt, use, metric, mtu, win, irtt;
+ int result;
+ FILE *fp;
+
+ fp = fopen("/proc/net/route", "r");
+ if (fp == NULL)
+ return 0;
+ /* Skip the header line */
+ if (fscanf(fp, "%*[^\n]\n") < 0) {
+ fclose(fp);
+ return 0;
+ }
+ ifc_init();
+ result = 0;
+ for (;;) {
+ int nread = fscanf(fp, "%63s%X%X%X%d%d%d%X%d%d%d\n",
+ name, &dest, &gway, &flags, &refcnt, &use, &metric, &mask,
+ &mtu, &win, &irtt);
+ if (nread != 11) {
+ break;
+ }
+ if ((flags & (RTF_UP|RTF_GATEWAY)) == (RTF_UP|RTF_GATEWAY)
+ && dest == 0
+ && strcmp(ifname, name) == 0) {
+ result = gway;
+ break;
+ }
+ }
+ fclose(fp);
+ ifc_close();
+ return result;
+}
+
+/*
+ * Sets the specified gateway as the default route for the named interface.
+ */
+int ifc_set_default_route(const char *ifname, in_addr_t gateway)
+{
+ struct in_addr addr;
+ int result;
+
+ ifc_init();
+ addr.s_addr = gateway;
+ if ((result = ifc_create_default_route(ifname, gateway)) < 0) {
+ LOGD("failed to add %s as default route for %s: %s",
+ inet_ntoa(addr), ifname, strerror(errno));
+ }
+ ifc_close();
+ return result;
+}
+
+/*
+ * Removes the default route for the named interface.
+ */
+int ifc_remove_default_route(const char *ifname)
+{
+ struct rtentry rt;
+ int result;
+
+ ifc_init();
+ memset(&rt, 0, sizeof(rt));
+ rt.rt_dev = (void *)ifname;
+ rt.rt_flags = RTF_UP|RTF_GATEWAY;
+ init_sockaddr_in(&rt.rt_dst, 0);
+ if ((result = ioctl(ifc_ctl_sock, SIOCDELRT, &rt)) < 0) {
+ LOGD("failed to remove default route for %s: %s", ifname, strerror(errno));
+ }
+ ifc_close();
+ return result;
+}
+
+int
+ifc_configure(const char *ifname,
+ in_addr_t address,
+ in_addr_t netmask,
+ in_addr_t gateway,
+ in_addr_t dns1,
+ in_addr_t dns2) {
+
+ char dns_prop_name[PROPERTY_KEY_MAX];
+
+ ifc_init();
+
+ if (ifc_up(ifname)) {
+ printerr("failed to turn on interface %s: %s\n", ifname, strerror(errno));
+ ifc_close();
+ return -1;
+ }
+ if (ifc_set_addr(ifname, address)) {
+ printerr("failed to set ipaddr %s: %s\n", ipaddr_to_string(address), strerror(errno));
+ ifc_close();
+ return -1;
+ }
+ if (ifc_set_mask(ifname, netmask)) {
+ printerr("failed to set netmask %s: %s\n", ipaddr_to_string(netmask), strerror(errno));
+ ifc_close();
+ return -1;
+ }
+ if (ifc_create_default_route(ifname, gateway)) {
+ printerr("failed to set default route %s: %s\n", ipaddr_to_string(gateway), strerror(errno));
+ ifc_close();
+ return -1;
+ }
+
+ ifc_close();
+
+ snprintf(dns_prop_name, sizeof(dns_prop_name), "dhcp.%s.dns1", ifname);
+ property_set(dns_prop_name, dns1 ? ipaddr_to_string(dns1) : "");
+ snprintf(dns_prop_name, sizeof(dns_prop_name), "dhcp.%s.dns2", ifname);
+ property_set(dns_prop_name, dns2 ? ipaddr_to_string(dns2) : "");
+
+ return 0;
+}